'One-in-a-million police officer'

The group of supporters included Mark and Faye Leveson, whose son Matthew's disappearance was investigated by Mr Jubelin.

"We feel that his success and high profile have embarrassed and upset a number of overambitious superiors who placed their own careers before the task they were sworn to do," Mr Leveson said.

"I hope these police superiors are proud of themselves, because they will have questions to answer once Gary's matter is finalised."

Mr Leveson said he and his wife could not conceive what it would be like to lose their "go-to person" during an inquest into their son's murder, and it was "bloody disgusting" that this had happened to William Tyrrell's family.

Leonie Duroux, an aunt of one of the murdered Bowraville children, whose case was also investigated by Mr Jubelin, said the charges should be dropped.

"It's a witch hunt. They're leaving victims families in the lurch and it's not fair," she said.